Real-world efficacy of ribociclib (RIB) plus aromatase inhibitor (AI)/fulvestrant (FUL), or endocrine monotherapy (ET), or chemotherapy (CT) as first-line (1L) treatment (tx) in elderly patients (pts; > 75 years) with hormone receptor-positive (HR plus ), human epidermal growth factor receptor-2-negative (HER2-) advanced breast cancer (ABC): Results of fifth interim analysis (IA) from RIBANNA